Dictaphone mandrel



June 8 1926.

J. A. DIENNER DICTAPHONE MANDREL Filed May 18, 1921 A W a 5 gim- Qfn ln QA $232736) iatented June 8, 1926.

U NI TED E S N T. OFF l-i'C' E JOHN-A. DIE'NNER', OFCHIGAG'G, ILLINOIS.

DICTAPHONE MANDREL;

Application filed May 18, 1921... Serial No. 470,587.

My invention relates to mandrels, particularly; of the class such as-are employed 1n holding the cylindrical waxsrecord of talking machines. such as are known under the trade name-of dictaphone. v

1 have observed in the operation of these machines that the removal. of. the cylinder from the mandrel is attendedwith consider-;

able inconvenience due to the fact that means offiof the. mandrel, and may be received by the hand; which performs this operation.

Other andincidental objects of my invention will; be apparent from the. following: description.

In the: accompanying dnawi'ngs,,forming1 a par-.tzof the present specification, I- have illustratedv an embodimentof: my invention.

Figurel is alongitudinal axial section of a (device; embodyingimy invention; and;

Figure 2 isanien-d view thereof. The mandrelil maybe made of any suitable material' eithersolid or hollow for re ceiving the wax cylinder '2 uponxwhiclrzthe record ismade. Themandrell is supported upon andvdr iven through a shaft 3'which. is secured to :themandrel in any convementi The mandrel is or well: known manner; preferably provided with a flange 4: which limits the axial: movement of the blank: in wardly into place, and. is provided: with:

spring pressecLplates or lands 5' which; tend to center the cylinder and hold the same with a-suitable degree of frictionkupon' the mandreh Disposed oirtli'e outer end of the mandrel, I provide means; in the. form Ofi a plate or button 6, which is connected through a rod or shaft; 'Tw-i'th a pair of lever arms 89 pivoted in the mandrel at 1011 and having their inner ends connected to the shaft or rod 7 by a slotted cross piece 12. The cross piece 12 is slotted in order to receive the pins 13-14, which are connected to the ends of the inner arms of the levers S and 9.

A spring 16 is provided in the mandrel for normally withdrawing the levers 8 and 9 from contact with the cylinder 2.

The spring pressed plates '5' are formed: of sheet. metal, folded into U shape as is indicated in Figure 2, andthese pieces are prei 'entedlfrom coming out of the opening in which they are set by extending end pieces 17 as is clears-from Figure 1.

The operation of the device-is asfollows:

The. cylinderis picked up in the usual manner by inserting the fingers on the inside of the same and is then placed upon :the

mandrel andthe fingers areremovedwhile.

the cylinder is shoved with the flatof the hand upon the mandrel. The cylinder may then be scribed in the well knownmanner, and when it is desired to remove the-cylinder zfroma the :mandreh. the needle is raised from the cylinder, and'withtthe second and third fingers ofthe right hand the" operator presses upon'the plate or button 6, whereuponithe levers 8 and 9 are caused to push upon the inner end of thewcylinder, pushing itl for a short wayoif of'the' mandrel so that the fingers of. the hand maybe free to pull the cylinder oifof the mandrel. ItT is to be noted that the mandret isnmade with a. slight taper so that assoonLas the cylinder 1S start'ecbfon a shortdistance ofi'cof the mandrel, the: cylinder: will (come? off the rest:

of: theiway quite easily.

I believe that I am the first -'to:provide a member on the: mandrel itself for removing the! wax cylinder.

'1 do not intendito be limited to the precise construction shown;

I: clannz: 1. In a sound recording and reproducing machine the combination with a sound record cylinder of a tapered mandrel adapted to=support and rotate said record cylinder and pivoted members whereby said record cylinder may b'e moved' longitudinat ly towards the-small end of said mandrel, and means disposed cO a'X'ialIy of the mandrel and movablerelative to the mand'rel for effecting the operationiof the pivote'd mem bers. i

2. In a sound recording and reproducing machine the combination with a sound record cylinder of a tapered mandrel adapted to support and rotate said. record cylinder and pivoted members whereby said record cylinder may be moved longitudinally towards the small end of said mandrel, and means disposed coaxially of the mandrel for effecting the operation of the pivoted iembers, said coaxial means having a button at the small end of the mandrel and movable relative to the mandrel adapted to be struck by the fingers of the operator to project the cylinder out over said fingers,

receiving a cylinder, a swinging lever carried by the mandrel for engaging the inner end of the cylinder to'fo rce the same oil the mandrel, and a slidable rod axially disposed in the cylinderand extending to the outer end of the cylinder.

5. In combination, a tapered cylinder re ceiving mandrel, a push plate at the small end of the mandrel engageable by the lingersof the hand of the operator, said push plate being movable with respect to the mandrel, and means actuated by the push plate for throwing-the cylinder outwardly a suflicientdistance toembrace the fingers which engage the plate.

6. In combination, a relatively stationary mandrel for supporting a cylinder, a relatively movable push rod mounted on the mandrel, and means mounted on the mandrel and connected to the push rod for shifting the cylinder axially toward the end of the mandrel.

7. In combination, a relatively stationary tapered mandrel, resilient engaging means mounted on the mandrel for engaging and trictionally holding a cylinder, a finger piece at the small end of the mandrel, stripping means at the larger end of the mandrel, and means mounted on, the mandrel and movable with respect thereto connecting said finger piece and said stripping member.

8. In combination, a tapered mandrel having resilient cylinder engaging members for frictionally holding a cylinder, said mandrel being held against axial motion, stri ning means at the inner end of the mandiel, and means extending from the outer end of the mandrel to said stripping means and axially movable with respect to said mandrel for actuating said stripping ing a finger piece lying at one end of the mandrel and being axially movable towards the other end of the mandrel to strip the cylinder from the mandrel in the opposite direction. 10. In combination, a tapered mandrel held against axial motion, a shaft supporting one end of the mandrel, a finger piece at the opposite end of the mandrel, and stripping means lying at the larger end of the mandrel and being connected to the finger piece for projecting the cylinder over the fingers of the operator when the finger piece is pushed axially with respect to the mandrel.

11. In combination, a tapered cylinder re ceiving mandrel adapted to receive a cylinder, means at the large end of the mandrel for pushing the cylinder out over the small end of the mandrel, and a push plate at the small end of the mandrel and connected to said cylinder pushing means and adapted to be engaged by the fingers of the operator, said push plate being disposed substantially flush with the end of the cylinder'whenthe cylinder is in place upon the mandrel and moving inwardly as the cylinder is pushed outwardly to carry the fingers of the operator inside the cylinder as the cylinder is pushed from the mandrel.

12. In combination a mandrel for supporting a cylinder along substantially its full length, stripping ,means for engaging the innerend of the cylinder to disengage the cylinder from the mandrel, actuating means at the outer end of the mandrel adapted to be engaged by the fingers of the operator, and to be carried axially within the end of the cylinder, so that the cylinder whenreleased embraces the fingers of the operator which engage the actuating means. Inwitness whereof, I hereunto subscribe my name this 12 day of May, 1921.'

JOHN A. DIENNER. 

